Source note · Passing call context with SIP UUI and custom headers
In Dynamics 365 Contact Center a SIP X header name is limited to 64 characters and its value to 256 characters.
Checked 2026-10-02
- Vendor
- Microsoft
- Product
- Dynamics 365 Contact Center
- Subsystem
- voice context transfer
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- 2025 release wave 2
- Checked
- 2026-10-02
Sources
- Enable SIP X header support for context transfer — Microsoft · tier 2 current vendor documentation · Feature details, technical limitations
Cite this note
APA
WarmTransfer. (2026, October 2). Passing call context with SIP UUI and custom headers: source note sip-uui-context-passing-d365-x-header-size-limits. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-uui-context-passing-d365-x-header-size-limits
BibTeX
@misc{warmtransfer-claim-sip-uui-context-passing-d365-x-header-size-limits,
title = {Passing call context with SIP UUI and custom headers: source note sip-uui-context-passing-d365-x-header-size-limits},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-uui-context-passing-d365-x-header-size-limits},
note = {Source note sip-uui-context-passing-d365-x-header-size-limits, checked 2026-10-02}
}